# What does boosting testosterone do

Generic gradient boosting at the m -th step would fit a decision tree h m ( x ) {\displaystyle h_{m}(x)} to pseudo-residuals. Let J m {\displaystyle J_{m}} be the number of its leaves. The tree partitions the input space into J m {\displaystyle J_{m}} disjoint regions R 1 m , … , R J m m {\displaystyle R_{1m},\ldots ,R_{J_{m}m}} and predicts a constant value in each region. Using the indicator notation , the output of h m ( x ) {\displaystyle h_{m}(x)} for input x can be written as the sum: